LG PF610P.AEU Owner's Manual page 93

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• [Brightest]
It displays the maximum screen brightness under appropriate image conditions.
• [Expert (Bright Room)]/[Expert (Dark Room)]
This mode is suitable for movies, etc. viewed in a dark environment.
[Expert (Dark Room)]] has lower colour temperature than [Expert (Bright
Room)]. Select a mode that is suitable for the movie you are watching.